I have a ford f-150 the power steering is working fine but the pump is screaming

fluid is full but I don,t see it circulating.

I've seen the reservoir get clogged and restrict fluid flow!.... Can't recall the setup on this vehicle but it's something to look in to! Might need a good flushing... Also, a new fluid type is aval. now, think it's Mercron V...maybe google that for more info... Another thing to check for is a TSB... (Technical Service Bulletin) issued to assist in correcting this problem!... Juan's random thoughts but also check for an idler/tensioner pulley bearing whine!!!

thank you I will try it

Added another possibility to last post!

Name this "STUFF"..!!... Snake oil?